RPi Pico as SPI slave

[Myungjin-Jung]

I am going to build multiple RPi Picos as SPI slaves connected to one RPi pico as a master using micropython.
And, I cannot find any examples or documents on making RPi Pico an SPI slave.
I have checked the sck pins, and it looks like the clock from the master is somewhat attenuated and was mixed with the slave's clock signal.
Is there any help I can get?
Thank you.

[robert-hh]

The RP2040 port does not support SPI slave mode. The only ports that do are STM32 and CC3200.

[GitHubsSilverBullet]

You could set the SPI registers (datasheet) directly, using mem32, @viper or @asm_thumb.
If you combine that with the DMA capabilities, you're ready to go.